diff-project

A comparison tool for a dotforge project, showing changes since its last synchronization. It checks recorded file versions and hashes, which are fingerprints used to detect file changes.

In plain words
What is it for?
Use it to inspect a project's synchronization baseline, find local changes, review newer dotforge changes, and decide whether to run a sync.
Why use it?
It helps you see whether the project or dotforge has changed before deciding whether synchronization is needed. It also identifies modified or deleted managed files.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/luiseiman/dotforge/diff-project
Any agent
npx skills add luiseiman/dotforge --skill diff-project
Clone the repo
git clone --depth 1 https://github.com/luiseiman/dotforge

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 651 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00025 $0.00651
Opus 5 $0.00013 $0.00326
Sonnet 5 $0.00005 $0.00130
Haiku 4.5 $0.00003 $0.00065

Measured yesterday against content hash b177698e1fe7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

diff-project scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/diff-project/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Diff Project

Show what changed in dotforge since the last synchronization of the current project.

Step 1: Identify project baseline

  1. Read $DOTFORGE_DIR/registry/projects.yml
  2. Find the current project by path (compare with $PWD)
  3. Get dotforge_version and last_sync
  4. If no dotforge_version is registered (null), report:
    Project not synced — no baseline to compare against.
    Run /forge sync to establish baseline.
    
    And stop.

Step 2: Verify local manifest

If .claude/.forge-manifest.json exists in the current project:

  1. Read it and get the version and file hashes
  2. For each file in the manifest, calculate shasum -a 256 <file> | cut -d' ' -f1
  3. Compare against the registered hash
  4. Report locally modified files (hash differs) and deleted files
  5. Use the manifest version as baseline (more precise than the registry)

If manifest does NOT exist, continue to Step 3 using git log.

Step 3: Detect changes in dotforge

Run in $DOTFORGE_DIR/:

git log --oneline v<version>..HEAD -- template/ stacks/

Where <version> is the tag corresponding to the project's dotforge_version.

If the tag does not exist, use last_sync as reference:

git log --oneline --since="<last_sync>" -- template/ stacks/

If there are no relevant commits, report:

dotforge has no changes in template/stacks since v<version>.
Project is up to date.

Step 4: Show change summary

For each modified file in template/ or relevant stacks/ for the project:

═══ DIFF dotforge: v<previous> → v<current> ═══
Project: <name> (last sync: <date>)

Files modified in dotforge:
  template/hooks/block-destructive.sh — <diff summary>
  template/rules/_common.md — <diff summary>
  stacks/python-fastapi/rules/backend.md — <diff summary>

Local files with modifications (vs manifest):
  .claude/rules/_common.md — hash differs from deployed

Filter stacks/ to show only the stacks used by the project (read from registry).

Step 5: Recommend action

Read the full file on GitHub · 91 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 91 lines · 25 tokens per session scan A b177698e1fe7

Subscribe to this mod's changes

diff-project is a skill published in the GitHub repository luiseiman/dotforge (8 stars, last pushed 2mo ago), licensed MIT. It adds 25 tokens to every session and 651 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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